Swertia L.

Tutin, T. G., Heywood, V. H., Burges, N. A., Moore, D. M., Valentine, D. H., Walters, S. M. & Webb, D. A., 1972, Flora Europaea. Volume 3. Diapensiacea to Myoporaceae, Cambridge: Cambridge University Press : 67

8. Swertia L. 1

Glabrous perennial herbs. Calyx 4- to 5-lobed almost to base. Corolla rotate, 4- to 5-lobed almost to base, each lobe with 2 fimbriate nectaries near the base. Anthers basifixed, usually sagittate. Ovary unilocular, ovoid, narrowed to the sessile, 2-lobed stigma.